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Visitors to the Dublin Zoo got a good lesson in what happens when you wake up a tiger that doesn't want to be woken up. In a video of a tiger enclosure uploaded to YouTube on April 9, one tiger walks up to a sleeping tiger and instead of just politely asking it—"Hey. Pssst. Are you sleeping or dead?"—awake tiger tries to play the game attack sleeping tiger. The now-all-of-a-sudden-not-sleeping tiger wakes up in full combat mode (like some teenagers), swatting angrily at its waker-upper.